diff --git a/hw/isa-bus.c b/hw/isa-bus.c
index 1cb497f..d067505 100644
--- a/hw/isa-bus.c
+++ b/hw/isa-bus.c
@@ -24,6 +24,7 @@
 
 struct ISABus {
     BusState qbus;
+    MemoryRegion *address_space_io;
     qemu_irq *irqs;
 };
 static ISABus *isabus;
@@ -39,7 +40,7 @@ static struct BusInfo isa_bus_info = {
     .get_fw_dev_path = isabus_get_fw_dev_path,
 };
 
-ISABus *isa_bus_new(DeviceState *dev)
+ISABus *isa_bus_new(DeviceState *dev, MemoryRegion *address_space_io)
 {
     if (isabus) {
         fprintf(stderr, "Can't create a second ISA bus\n");
@@ -51,6 +52,7 @@ ISABus *isa_bus_new(DeviceState *dev)
     }
 
     isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));
+    isabus->address_space_io = address_space_io;
     return isabus;
 }
 
diff --git a/hw/isa.h b/hw/isa.h
index f344699..390e2d4 100644
--- a/hw/isa.h
+++ b/hw/isa.h
@@ -25,7 +25,7 @@ struct ISADeviceInfo {
     isa_qdev_initfn init;
 };
 
-ISABus *isa_bus_new(DeviceState *dev);
+ISABus *isa_bus_new(DeviceState *dev, MemoryRegion *address_space_io);
 void isa_bus_irqs(qemu_irq *irqs);
 qemu_irq isa_get_irq(int isairq);
 void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq);
diff --git a/hw/mips_jazz.c b/hw/mips_jazz.c
index 91e15b9..4aa5aa4 100644
--- a/hw/mips_jazz.c
+++ b/hw/mips_jazz.c
@@ -102,10 +102,11 @@ static void cpu_request_exit(void *opaque, int irq, int level)
     }
 }
 
-static
-void mips_jazz_init (MemoryRegion *address_space, ram_addr_t ram_size,
-                     const char *cpu_model,
-                     enum jazz_model_e jazz_model)
+static void mips_jazz_init(MemoryRegion *address_space,
+                           MemoryRegion *address_space_io,
+                           ram_addr_t ram_size,
+                           const char *cpu_model,
+                           enum jazz_model_e jazz_model)
 {
     char *filename;
     int bios_size, n;
@@ -181,7 +182,7 @@ void mips_jazz_init (MemoryRegion *address_space, ram_addr_t ram_size,
 
     /* ISA devices */
     i8259 = i8259_init(env->irq[4]);
-    isa_bus_new(NULL);
+    isa_bus_new(NULL, address_space_io);
     isa_bus_irqs(i8259);
     cpu_exit_irq = qemu_allocate_irqs(cpu_request_exit, NULL, 1);
     DMA_init(0, cpu_exit_irq);
@@ -286,7 +287,8 @@ void mips_magnum_init (ram_addr_t ram_size,
                        const char *kernel_filename, const char *kernel_cmdline,
                        const char *initrd_filename, const char *cpu_model)
 {
-    mips_jazz_init(get_system_memory(), ram_size, cpu_model, JAZZ_MAGNUM);
+        mips_jazz_init(get_system_memory(), get_system_io(),
+                       ram_size, cpu_model, JAZZ_MAGNUM);
 }
 
 static
@@ -295,7 +297,8 @@ void mips_pica61_init (ram_addr_t ram_size,
                        const char *kernel_filename, const char *kernel_cmdline,
                        const char *initrd_filename, const char *cpu_model)
 {
-    mips_jazz_init(get_system_memory(), ram_size, cpu_model, JAZZ_PICA61);
+    mips_jazz_init(get_system_memory(), get_system_io(),
+                   ram_size, cpu_model, JAZZ_PICA61);
 }
 
 static QEMUMachine mips_magnum_machine = {
diff --git a/hw/mips_r4k.c b/hw/mips_r4k.c
index efa4b05..670acd4 100644
--- a/hw/mips_r4k.c
+++ b/hw/mips_r4k.c
@@ -259,7 +259,7 @@ void mips_r4k_init (ram_addr_t ram_size,
 
     /* The PIC is attached to the MIPS CPU INT0 pin */
     i8259 = i8259_init(env->irq[2]);
-    isa_bus_new(NULL);
+    isa_bus_new(NULL, get_system_io());
     isa_bus_irqs(i8259);
 
     rtc_init(2000, NULL);
diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 75d96d9..9a8f580 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -149,7 +149,7 @@ static void pc_init1(MemoryRegion *system_memory,
     } else {
         pci_bus = NULL;
         i440fx_state = NULL;
-        isa_bus_new(NULL);
+        isa_bus_new(NULL, system_io);
     }
     isa_bus_irqs(isa_irq);
 
diff --git a/hw/piix4.c b/hw/piix4.c
index 9590e7b..2fd1171 100644
--- a/hw/piix4.c
+++ b/hw/piix4.c
@@ -87,7 +87,7 @@ static int piix4_initfn(PCIDevice *dev)
 {
     PIIX4State *d = DO_UPCAST(PIIX4State, dev, dev);
 
-    isa_bus_new(&d->dev.qdev);
+    isa_bus_new(&d->dev.qdev, pci_address_space_io(dev));
     piix4_dev = &d->dev;
     qemu_register_reset(piix4_reset, d);
     return 0;
diff --git a/hw/piix_pci.c b/hw/piix_pci.c
index 8f6ea42..d183443 100644
--- a/hw/piix_pci.c
+++ b/hw/piix_pci.c
@@ -504,7 +504,7 @@ static int piix3_initfn(PCIDevice *dev)
 {
     PIIX3State *d = DO_UPCAST(PIIX3State, dev, dev);
 
-    isa_bus_new(&d->dev.qdev);
+    isa_bus_new(&d->dev.qdev, pci_address_space_io(dev));
     qemu_register_reset(piix3_reset, d);
     return 0;
 }
diff --git a/hw/ppc_prep.c b/hw/ppc_prep.c
index 515de42..f9325bd 100644
--- a/hw/ppc_prep.c
+++ b/hw/ppc_prep.c
@@ -651,7 +651,7 @@ static void ppc_prep_init (ram_addr_t ram_size,
     i8259 = i8259_init(first_cpu->irq_inputs[PPC6xx_INPUT_INT]);
     pci_bus = pci_prep_init(i8259, get_system_memory(), get_system_io());
     /* Hmm, prep has no pci-isa bridge ??? */
-    isa_bus_new(NULL);
+    isa_bus_new(NULL, get_system_io());
     isa_bus_irqs(i8259);
     //    pci_bus = i440fx_init();
     /* Register 8 MB of ISA IO space (needed for non-contiguous map) */
diff --git a/hw/sun4u.c b/hw/sun4u.c
index 1b60e4e..6b2983b 100644
--- a/hw/sun4u.c
+++ b/hw/sun4u.c
@@ -544,7 +544,7 @@ pci_ebus_init1(PCIDevice *pci_dev)
 {
     EbusState *s = DO_UPCAST(EbusState, pci_dev, pci_dev);
 
-    isa_bus_new(&pci_dev->qdev);
+    isa_bus_new(&pci_dev->qdev, pci_address_space_io(pci_dev));
 
     pci_dev->config[0x04] = 0x06; // command = bus master, pci mem
     pci_dev->config[0x05] = 0x00;
diff --git a/hw/vt82c686.c b/hw/vt82c686.c
index 5c973ed..e2b179e 100644
--- a/hw/vt82c686.c
+++ b/hw/vt82c686.c
@@ -490,7 +490,7 @@ static int vt82c686b_initfn(PCIDevice *d)
     uint8_t *wmask;
     int i;
 
-    isa_bus_new(&d->qdev);
+    isa_bus_new(&d->qdev, pci_address_space_io(d));
 
     pci_conf = d->config;
     pci_config_set_prog_interface(pci_conf, 0x0);
